Entering the room I found Mary at the desk and a letter.A. Seated；wroteB. Sitting；written

问题补充：

Entering the room, I found Mary at the desk and a letter.

A. Seated；wrote

B. Sitting；written

C. Seating；writing

D. Seated；writing

答案：

A. Seated；wrote

B. Sitting；written

C. Seating；writing

(答案→)D. Seated；writing

解析：考查非谓语动词。seated和sitting 表坐着的状态，第一格分词作find后面宾语的补足语；根据句意，发现Mary正坐着，故seated 和sitting均可。排除C; 第二格，仍然是宾语补足语，补充说明Mary的状态，而Mary和write之间是主动关系，故用writing。